ArrayExtension.swift

extension Array {
    func shuffle() -> [Element] {
        var shuffledCollection = self
        var remainingElements = self.count
        
        while remainingElements > 0 {
            let currentIndex = remainingElements - 1
            let newIndex = Int(arc4random_uniform(UInt32(remainingElements)))
            
            let temp = shuffledCollection[currentIndex]
            shuffledCollection[currentIndex] = shuffledCollection[newIndex]
            shuffledCollection[newIndex] = temp
            
            remainingElements -= 1
        }
        
        return shuffledCollection
    }
}